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/**
* wsgcrypt.h
*
* Created on 2020-11-26
* @author: qyc
*
* @explain:
*/
#ifndef WSGCRYPT_H
#define WSGCRYPT_H
#ifdef __cplusplus
extern "C" {
#endif
#include "gcrypt.h"
#include "glib.h"
/*
* Define HAVE_LIBGCRYPT_AEAD here, because it's used in several source
* files.
*/
#if GCRYPT_VERSION_NUMBER >= 0x010600 /* 1.6.0 */
/* Whether to provide support for authentication in addition to decryption. */
#define HAVE_LIBGCRYPT_AEAD
#endif
/*
* Define some other "do we have?" items as well.
*/
#if GCRYPT_VERSION_NUMBER >= 0x010700 /* 1.7.0 */
/* Whether ChaCh20 PNE can be supported. */
#define HAVE_LIBGCRYPT_CHACHA20
/* Whether AEAD_CHACHA20_POLY1305 can be supported. */
#define HAVE_LIBGCRYPT_CHACHA20_POLY1305
#endif
#define HASH_SHA2_256_LENGTH 32
/* Convenience function to calculate the HMAC from the data in BUFFER
of size LENGTH with key KEY of size KEYLEN using the algorithm ALGO avoiding the creating of a
hash object. The hash is returned in the caller provided buffer
DIGEST which must be large enough to hold the digest of the given
algorithm. */
gcry_error_t ws_hmac_buffer(int algo, void *digest, const void *buffer, size_t length, const void *key, size_t keylen);
/**
* RFC 5869 HMAC-based Extract-and-Expand Key Derivation Function (HKDF):
* HKDF-Expand(PRK, info, L) -> OKM
*
* @param hashalgo [in] Libgcrypt hash algorithm identifier.
* @param prk [in] Pseudo-random key.
* @param prk_len [in] Length of prk.
* @param info [in] Optional context (can be NULL if info_len is zero).
* @param info_len [in] Length of info.
* @param out [out] Output keying material.
* @param out_len [in] Size of output keying material.
* @return 0 on success and an error code otherwise.
*/
gcry_error_t hkdf_expand(int hashalgo, const guint8 *prk, guint prk_len, const guint8 *info, guint info_len, guint8 *out, guint out_len);
/*
* Calculate HKDF-Extract(salt, IKM) -> PRK according to RFC 5869.
* Caller MUST ensure that 'prk' is large enough to store the digest from hash
* algorithm 'hashalgo' (e.g. 32 bytes for SHA-256).
*/
static inline gcry_error_t hkdf_extract(int hashalgo, const guint8 *salt, size_t salt_len, const guint8 *ikm, size_t ikm_len, guint8 *prk)
{
/* PRK = HMAC-Hash(salt, IKM) where salt is key, and IKM is input. */
return ws_hmac_buffer(hashalgo, prk, ikm, ikm_len, salt, salt_len);
}
#ifdef __cplusplus
}
#endif
#endif //WSGCRYPT_H
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